wade law of the land long settled. but after 40 years the division remain. >> plus some of the coldest air in a couple of years. >> it's like needle sticking in your face. >> no matter how cold it gets in the bay area, at least it's in the bay area, at least it's never like this. stay withíáf- is. >> new pipeline scanner could take the guess work out of determining which natural gas line are safe. pg&e is testing it writ now. it's part of the utility ongoing evident to improve its safety program ever since of course that deadly 2010 san bruno explosion. here's heather. >>reporter: pg&e san ramone technology center is a testing facility worthy of a science fiction movie set but here it's science reality. >> laser. then these 3 writ here are cameras. >>reporter: this 3d laser scanner maps the surface of natural gas pipeline in high def down to the virtually invisible measurement of 40 mike ron about the width of the smallest human hair. it shows engineers and can calculate for them whether external pipe corrosion is ba